3), Oxalis acetosella (wood sorrel) and Lamium amplexicaule are commonly occurring instances.
In Labiate plants, as the dead-nettle (Lamium), the flowers are produced in the axil of each of the foliage leaves of the plant, and they appear as if arranged in a simple whorl of flowers.
- Flowering stalk of the White Dead-nettle (Lamium album).
So also in Labiatae, such as dead-nettle (Lamium), the different whorls of inflorescence are developed centripetally, while the florets of the verticillaster are centrifugal.
- Irregular gamopetalous labiate corolla of the Dead-nettle (Lamium album).